23322221 has 4 divisors (see below), whose sum is σ = 25116252. Its totient is φ = 21528192.

The previous prime is 23322197. The next prime is 23322223. The reversal of 23322221 is 12222332.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9853321 + 13468900 = 3139^2 + 3670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23322221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23322221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23322223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896996 + ... + 897021.

It is an arithmetic number, because the mean of its divisors is an integer number (6279063).

Almost surely, 2^23322221 is an apocalyptic number.

It is an amenable number.

23322221 is a deficient number, since it is larger than the sum of its proper divisors (1794031).

23322221 is a wasteful number, since it uses less digits than its factorization.

23322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794030.

The product of its digits is 288, while the sum is 17.

The square root of 23322221 is about 4829.3085426384. The cubic root of 23322221 is about 285.7085927794.

Adding to 23322221 its reverse (12222332), we get a palindrome (35544553).

The spelling of 23322221 in words is "twenty-three million, three hundred twenty-two thousand, two hundred twenty-one".